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Abstract In the presence of catalytic amounts of organoantimony(V) halides such as Ph 4 SbI, Ph 4 SbBr, Ph 3 SbBr 2 , and Ph 3 SbCl 2 , the cycloaddition of aziridines 1a – g with heterocumulenes (phenyl isothiocyanate, carbon disulfide, and carbon dioxide) selectively gave ring‐expanded cycloadducts 3a – d , f , g , and 6e by α‐cleavage of the aziridine rings.
Nomura et al. (Fri,) studied this question.